The Jigsaw ransomware encrypts victim's files with AES and appends one of many extensions, including ".fun". An image is then displayed with a threat to delete files after a certain amount of time.
This is an example of the ransom text displayed to the victim:
All Your personal files have been AES encrypted. Your photos, videos, documents, etc... If you look around your PC you cannot access them:) You must send me $100 USD in bitcoin to the address below if you want your files back. This expliot will starts out slowly then increases rapidly deleting files During the first 24 hour you will only lose a few files, the second day a few hundred, the third day a few thousand, and so on If you turn off your computer or try to close me, when I start next time. you will get 900 files deleted as a punishment I am the only one that is capiable of decyrpting your data contact me via email if you have questions Only After the bitcoin payment is sent your files will be decrypted You must buy bitcoin from one of the many exchange sites then send coin too are address below How too buy bitcoin google search or Check out this link https://localbitcoins.com/guides/how-to-buy-bitcoins Now, let's enjoy our game together